Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:3341029.
This is a Lithophane lamp I designed for a buddy's bar. He is a Renegade Pig. It takes a panel roughly 150mm x 115mm. Print the lamp and then measure the inside opening to get the exact size based on what your printer produces. The panel is supposed to be friction fit. I lined the inside of mine with aluminium foil to help reflect more light to the panel. (Not sure if it helped or not but I did it anyway.) I also color printed the picture used for the lithophane and glued it to the back of the panel.
To get the lamp to work I used the following parts and hot glued them inside. There is a recess for the LED:
1 Watt Cool White LED - Heatsink Mounted: https://www.adafruit.com/product/518
USB Micro-B Breakout Board: https://www.adafruit.com/product/1833
I used a 27ohm resistor based on using the above parts from adafruit.
Otherwise use a resistor of appropriate value (Use http://ledcalc.com with the parameters from your sourced LED, voltage source @ 5V). Make sure your circuit doesn't go over the max allowed USB current (recommended 100 mA, absolute max 500 mA).
Standard Micro USB cable and charger. Basically any Android phone charger.
Printed in Tianse Cerulean Blue PLA then primed and painted black. (didn't have black PLA on hand at the time I printed it)